The Other Side of Existence: Portal to the Gods Book 2

The second book in the epic Portal to the Gods series.  The evil forces of Xenos rampage the lands unchecked and have laid an impenetrable siege to Athol Myr. It is only a matter of time before they crack its obsidian walls and lay claim to the Portal within, thus conquering humankind forever. Reeling from the loss of his powerful northern army, King Marius of Giron struggles to build an alliance of the southern kingdoms to ride to the aid of the holy fortress.
But the southern kings are divided. Some wish to see to the safety of their own borders, while others seek to profit from civilization's impending destruction. In his desperation Marius seeks the aid of Obadai the Seer - a man he long ago banished into Giron's unforgiving western wastelands. Griff and Dartain the Prophet lead a motley group toward Athol Myr on their mission to bring Tiberius back from the dead.
But it is an impossible task to penetrate the massive siege lines and if they are to succeed, one person must make the ultimate sacrifice.